Responses
Yes!! Yustaf doesn't really treat her like a sister although he call he noonim but that just for formalities; once he's the Duke or maybe once he realized he like Ran he won't address her as noonim anymore ╮(￣▽￣)╭
I agree. Theres probably more meaning behind his words when he told her "i dont see you as a sister" ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
It doesn't even feel like siblings love bruh and did you forgot that yus said he doesn't even see her as a sister?